🧹 Marketplace: DeliveryConstraints only set in DeliveryArea

- Prerequisite for #1420

- #1325
- #1136
- #1185

This does not get rid of the reading of the fields; but it does make it
so they are no longer writable; which will make the "stop reading from
them!" PR a bit tidier.

app/furniture/marketplace/cart.rb

@@ -12,6 +12,8 @@ class Cart < Record
 
     belongs_to :shopper, inverse_of: :carts
 
+    belongs_to :delivery_area, inverse_of: :carts, optional: true
+
     has_many :cart_products, dependent: :destroy, inverse_of: :cart
     has_many :products, through: :cart_products, inverse_of: :carts
 

app/furniture/marketplace/delivery_area.rb

@@ -5,6 +5,7 @@ class DeliveryArea < Record
 
     belongs_to :marketplace, inverse_of: :delivery_areas
     has_many :orders, inverse_of: :delivery_area
+    has_many :carts, inverse_of: :delivery_area
     has_many :deliveries, inverse_of: :delivery_area
 
     attribute :delivery_window, ::Marketplace::Delivery::WindowType.new

app/furniture/marketplace/marketplaces/_form.html.erb

@@ -1,9 +1,7 @@
 <div class="mt-3">
   <%= form_with model: marketplace.location do |f| %>
-    <%= render "money_field", { attribute: :delivery_fee, form: f, min: 0, step: 0.01} %>
     <%= render "text_field", { attribute: :notify_emails, form: f } %>
-    <%= render "text_field", { attribute: :order_by, form: f } %>
-    <%= render "text_field", { attribute: :delivery_window, form: f } %>
+
     <%= f.submit %>
   <% end %>
 </div>

spec/furniture/marketplace/cart_spec.rb

@@ -9,6 +9,8 @@
 
   it { is_expected.to belong_to(:shopper).inverse_of(:carts) }
 
+  it { is_expected.to belong_to(:delivery_area).inverse_of(:carts).optional }
+
   describe "#price_total" do
     subject(:price_total) { cart.price_total }
 

spec/furniture/marketplace/delivery_area_spec.rb

@@ -3,5 +3,6 @@
 RSpec.describe Marketplace::DeliveryArea, type: :model do
   it { is_expected.to belong_to(:marketplace).inverse_of(:delivery_areas) }
   it { is_expected.to have_many(:orders).inverse_of(:delivery_area) }
+  it { is_expected.to have_many(:carts).inverse_of(:delivery_area) }
   it { is_expected.to have_many(:deliveries).inverse_of(:delivery_area) }
 end